[ FBSD ] FreeBSD HD benchmark tools diskinfo

在 Linux 中有 hdparm 工具可量測硬碟效能，而 FreeBSD 中會找不到 hdparm 因此我們可以使用 diskinfo 這個工具來測試硬碟效能。

# diskinfo -t /dev/ad0
ad0
512 # sectorsize
13664550912 # mediasize in bytes (13G)
26688576 # mediasize in sectors
26476 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.

Seek times:
Full stroke: 250 iter in 5.524625 sec = 22.099 msec
Half stroke: 250 iter in 4.289534 sec = 17.158 msec
Quarter stroke: 500 iter in 7.275793 sec = 14.552 msec
Short forward: 400 iter in 3.218473 sec = 8.046 msec
Short backward: 400 iter in 3.699358 sec = 9.248 msec
Seq outer: 2048 iter in 0.394247 sec = 0.193 msec
Seq inner: 2048 iter in 0.394491 sec = 0.193 msec
Transfer rates:
outside: 102400 kbytes in 5.458743 sec = 18759 kbytes/sec
middle: 102400 kbytes in 6.100707 sec = 16785 kbytes/sec
inside: 102400 kbytes in 9.132279 sec = 11213 kbytes/sec